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WM97+
-
gas
fired water boiler
Boiler location
Installations must comply with:
•
Local, state, provincial, and national codes, laws, regulations
and ordinances.
•
National Fuel Gas Code, ANSI Z223.1/NFPA 54.
•
National Electrical Code.
•
For Canada only: CAN/CSA B149.1, Natural Gas and Pro-
pane Installation Code, and any local codes.
The WM97+ boiler gas manifold and controls met
safe lighting and other performance criteria when
boiler underwent tests specified in ANSI Z21.13
— latest edition.
Before mounting the boiler, check:
The boiler must be wall mounted
1. Wall construction —
Make sure the wall construction is suitable to carry the weight
of the boiler and components. See page 10 for instructions.
2. The boiler is suitable for INDOOR installation only.
3. Check for nearby connection to:
•
System water piping
•
Venting connections
•
Gas supply piping
•
Electrical power
•
Condensate drain
4. Check area around boiler. Remove any combustible materials,
gasoline and other flammable liquids.
Failure to keep boiler area clear and free of com-
bustible materials, gasoline and other flammable
liquids and vapors can result in severe personal
injury, death or substantial property damage.
5. The WM97+ boiler must be installed so that gas control
system components are protected from dripping or spraying
water or rain during operation or service.
6. If new boiler will replace existing boiler, check for and correct
system problems, such as:
•
Sediment or corrosion in system piping — clean and flush
piping BEFORE connecting the new boiler. See page 87.
•
System leaks causing oxygen corrosion or heat exchanger
cracks from hard water deposits.
•
Incorrectly-sized expansion tank.
•
Lack of freeze protection in boiler water causing system
and boiler to freeze and leak.
Residential garage installation
Precautions
1. Take the following special precautions when installing the
boiler in a residential garage. If the boiler is located in a
residential garage:
•
Mount the boiler with its bottom at least 18 inches above
the floor. This complies with the National Fuel Gas Code,
ANSI Z223.1 for U. S. installations, or CSA B149.1 and
B149.2 for Canadian installations.
•
Locate or protect the boiler so it cannot be damaged by
a moving vehicle.
– 8 –
— Boiler Manual
•
Ensure that the installation complies with all applicable
codes.
•
Prevent boiler water and condensate from freezing.
Provide air openings to room
WM97+ boiler alone in boiler room
1. No air ventilation openings into boiler room are needed if
clearances around WM97+ boiler are at least equal to the
SERVICE clearances shown in Figure 1, page 9.
2. For spaces that DO NOT supply the minimum service clear-
ances, provide two openings as shown in Figure 1, page 9.
Each opening must provide 1 square inch free area per 1,000
Btuh of boiler input.
WM97+ boiler in same space with other gas or
oil-fired appliances
.
1. Follow the sizing requirements shown in Figure 20, page 24.
The space must be provided with combustion/
ventilation air openings correctly sized for all ap-
pliances located in the same space as the WM97+
boiler.
Reinstall boiler jacket front door after servicing.
The boiler front door must be securely fastened
to the boiler to prevent boiler from drawing air
from inside the boiler room. This is particularly
important if the boiler is located in the same
room as other appliances.
Failure to comply with the above warnings
could result in severe personal injury, death or
substantial property damage.
Vent and air piping
1. The WM97+ boiler requires a special vent system, designed
for pressurized venting. WM97+ boilers are rated ANSI
Z21.13 Category IV (pressurized vent, likely to condense in
the vent). See instructions beginning on page 19.
2. You must also install air piping from outside to the boiler
air intake adapter. The resultant installation is categorized as
direct vent (sealed combustion). Note prevention of combus-
tion air contamination on page 19 when considering vent/
air termination.
3. Vent and air must terminate near one another unless oth-
erwise specified in this manual. Vent and air piping may be
routed vertically through the roof or out a side wall, following
the options give in this manual. You may use any of the vent/
air piping methods covered in this manual. Do not attempt
to install the WM97+ boiler using any other means.
4. Be sure to locate the boiler such that the vent and air piping
can be routed through the building and properly terminated.
The vent/air piping lengths, routing and termination method
must all comply with the methods and limits in instructions
beginning on page 19.
Part number 550-142-120/0113
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